Looks nice!
Just a couple helpful tips, if I may...
For the balance of the model...sanding a flat spot on the bottom of the wheels will help a lot to keep it standing properly (especially when the balance is so close!). I know, kinda hard now with this one...risk of breaking/damaging something is a bit high!
The other pics...painting...
The poster tac is a great mask, all on its own. I used to paint the same way (cut paper mask, held up with poster tac), but it left a lot of room for a bit of "under"spray, and I'd always end up with un-even edges. When I mask camo, I'll use tape, just to a point of being close, then roll up a "worm" of poster tac, and press it into place...spray away!!!